/**
 * 
 */
package com.designpattern.design.facade;

/**
 * 投影仪
 * 
 * @author zhangyang
 *
 */
public class Projector {

	private static Projector instance = new Projector();

	public static  Projector getInstance() {
		return instance;
	}

	public void on() {
		System.out.println("打开投影仪");
	}

	public void off() {
		System.out.println("关闭投影仪");
	}

	public void focus() {
		System.out.println("聚焦投影仪");
	}
}
